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Microstructural development and radiation hardening of neutron irradiated Mo-Re alloys

中性子重照射したMo-Re合金の微細組織発達及び照射硬化に関する研究

根本 義之  ; 長谷川 晃*; 佐藤 学*; 阿部 勝憲*; 平岡 裕*

Nemoto, Yoshiyuki; Hasegawa, Akira*; Sato, Manabu*; Abe, Katsunori*; Hiraoka, Yutaka*

本研究においては純Mo及びMo-Re合金(Re濃度2,4,5,10,13,41wt%)を、照射温度681K$$sim$$1072Kで約20dpaまで中性子重照射した試料を用いて研究を行った。微細組織観察において全てのMo-Re合金の照射試料で$$sigma$$相と$$chi$$相の析出物が観察された。また全ての照射試料でボイドが観察され、低温度で照射した試料では転位ループ及び転位が観察された。ビッカース硬さ試験では全ての照射試料において照射硬化が測定され、特にMo-41Reの874K以下で照射した試料において硬化量が大きくなった。これらの結果からMo-Re合金の中性子重照射による微細組織発達と照射硬化及び照射脆化との関連について議論を行い、照射下で使用するMo-Re合金への最適なRe添加量及び熱処理条件を提案した。

In this study, stress-relieved specimens and recrystallized specimens of pure Mo and Mo-Re alloys (Re content=2,4,5,10,13 and 41wt%) were neutron irradiated up to 20dpa at various temperatures (681-1072K). On microstructure observation, sigma phase and chi phase precipitates were observed in all irradiated Mo-Re alloys. Voids were observed in all irradiated specimen, and dislocation loops and dislocations were observed in the specimens that were irradiated at lower temperatures. On Vickers hardness testing, all of the irradiated specimens showed hardening. Especially Mo-41Re were drastically embrittled after irradiation at 874K or less. From these results, authors discuss about relation between microstructure development and radiation hardening, embrittlement, and propose the most efficient Re content and thermal treatment for Mo-Re alloys to be used under irradiation condition.

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パーセンタイル:89.82

分野:Materials Science, Multidisciplinary

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